Medical light source device

ABSTRACT

A medical light source device worn on the body of an operator enables the application range to be set at a state displaced from the direction in which the body currently faces. An acceleration sensor  106  is attached to a holder  7  to put an illumination section  1  on the body of the operator, and detects a motion of the body of the operator. When an application-range center position setting switch  107   b  is operated, a position detecting section  108  detects a center position based on the acceleration information detected by the acceleration sensor  106 , and an optical axis adjusting section  108  fixes the optical axis of the illumination section  1  to the detected center position. Then, the application angle of application light from the illumination section  1  is capable of being adjusted in a plurality of stages by an application control section  110.

RELATED APPLICATIONS

The present application is National Phase of International ApplicationNo. PCT/JP2012/063211 filed May 23, 2012, and claims priority fromJapanese Application No. 2011-267027, filed Dec. 6, 2011.

TECHNICAL FIELD

The present invention relates to a medical light source device forirradiating a treatment target portion with light in the medicaltreatment.

BACKGROUND ART

As a medical light source device used in the medical treatment(including operations), in order to enable an operator such as a medicaldoctor to increase a quantity of light applied to the treatment targetpart by oneself and secure sufficient brightness, it is known that theoperator wears the light source device on the body such as the head andperforms the medical treatment.

As such a light source device wearable on the body, a battery built-intype portable LED light is known which is provided with a clip capableof being put in a breast pocket or a brim of a cap of the operator (forexample, see Patent Document 1).

Further, known are configurations of a cap with a light in which the LEDlight is attached to the brim and a battery separate from the light isalso stored in the cap (for example, see Patent Documents 2 and 3).

PRIOR ART DOCUMENT Patent Document

-   Patent Document 1: Japanese Patent Application Publication No.    2006-185755-   Patent Document 2: Japanese Patent Application Publication No.    2008-210547-   Patent Document 3: Japanese Patent Application Publication No.    2009-293146

DISCLOSURE OF INVENTION Problems to be Solved by the Invention

However, in the light source device worn on the body, since theapplication direction is determined by facing the body toward theapplication target portion, it is not possible to make the direction inwhich the body faces and the application direction different from eachother.

For example, in the case of the medical light source device such thatthe light source device is worn on the head of the body, the operatorlooks at the treatment part, the head thereby faces in the direction toirradiate the treatment part, the position at which the operator looksand the treatment part match each other at this point, and light isapplied with this position being the center position of the illuminationrange. However, such a situation occurs that the operator lights withoutmatching the center position of the application range and the treatmentpart during the medical treatment. In other words, the situation is thecase of performing the medical treatment while checking the state ofanother part different from the treatment part, and at this point, whenthe another part is out of the application range, the operator needs tomove the head to change the application range from the treatment part tothe another part whenever the operator checks, and to perform extremelyburdensome work.

Therefore, desired is a medical light source device that requires theoperator only to change the eye line without moving the head to enablethe another part to be within the application range even when theposition of the head is not faced toward the another portion.

Further, in the medical treatment, for example, depending on thetreatment such as cutting and suture of a blood vessel or minute portionand the like, there is a case that the operator wants to irradiate witha higher quantity of light only for a short time. However, in such acase, the operator concentrates the operator's fingers on the treatmentpart, and when the operator performs switch operation for switching thequantity of light, lacks concentration, and therefore, desired is amedical light source device that enables the operator to perform switchoperation easily without using the fingers.

To solve the above-mentioned problems, it is an object of the presentinvention to provide a medical light source device that enables theapplication direction to be deflected in a state displaced from thedirection in which the body faces by setting.

Then, it is another object to provide a medical light source device thatenables switching of the quantity of light and illumination ON/OFF to beperformed without performing switch operation with the fingers.

Means for Solving the Problem

To attain the above-mentioned objects, a medical light source deviceaccording to the present invention is a medical light source device thatis worn on the body of an operator to apply light to a target portion ofthe medical treatment, and is characterized by having a holder to put anillumination section on the body of the operator, an acceleration sensorattached to the holder, a position detecting section that detects acenter position to hold based on acceleration information detected bythe acceleration sensor in setting the center position of an applicationrange, and an optical axis adjusting section that sets an optical axisof the illumination section at the detected center position. It is afeature that the holder is to put the illumination section and theacceleration sensor on the head of the operator.

Moreover, the device is characterized by further having an applicationcontrol section capable of adjusting an application angle of applicationlight from the illumination section in a plurality of stages.

Then, the acceleration sensor is characterized by having an X axis and aY axis that are mutually orthogonal, and being attached to the holder sothat the X axis tracks a right-and-left axis of the operator and thatthe Y axis tracks a back-and-forth axis of the operator. At this point,it is a feature that attachment of the acceleration sensor to the holderis beforehand provided with an angle. The acceleration sensor ischaracterized by being a three-axis sensor further including a Z axis.

Further, the device is characterized by having a reset means forclearing the center position held in the position detecting sensor tocancel setting of the optical axis.

A medical light source device according to the invention is a medicallight source device that is worn on the body of an operator to applylight to a target portion of the medical treatment, and is characterizedby having a holder to put an illumination section on the body of theoperator, a battery power supply section that supplies power to theillumination section, an acceleration sensor attached to the holder, amotion detecting section that detects a predetermined motion by theoperator based on acceleration information, and a light quantity controlsection that controls an amount of current fed from the battery powersupply section to the illumination section when the predetermined motionis detected.

Herein, it is a feature that the illumination section is provided with alight source having durability even when a passing current exceeds arated value, and that the light quantity control section changes anaverage current value fed from the battery power supply section to theillumination section from a rated value to an increase value higher thanthe rated value only for a predetermined period in increasing the amountof current. At this point, the predetermined period is set based on atemperature increase time characteristic of the light source due topassage of the increase value of current. Alternatively, thepredetermined period is set at a period during which a temperature ofthe light source does not exceed a maximum allowable value, based on thetemperature increase time characteristic of the light source.

Further, it is a feature that a second acceleration sensor is attachedto the holder, and that the light quantity control section switches avalue of current fed to the illumination section to the rated value ofcurrent when the acceleration sensor detects acceleration of apredetermined value or more in performing control for feeding theincrease value of current as the average current value fed to theillumination section.

It is another feature that the device is further provided with a voicerecognition section that recognizes a voice uttered by the operator, andthat the light quantity control section controls an amount of currentfed to the illumination section based on either the recognized voice inthe voice recognition section or the acceleration information.

Advantageous Effect of the Invention

According to the invention, the acceleration sensor is attached to theholder mounted with the illumination section, the center position of theapplication range of the illumination section is set at a position ofthe acceleration information due to a motion of the body at this point,and the direction of the body and the application direction aresubsequently fixed to different states even when the body moves. By thismeans, in such a medical treatment that the treatment is performed whilechecking another part different from the treatment part, the operator iscapable of checking both parts by changing the eye line while fixing thedirection of the body, and is thereby capable of concentrating on themedical treatment.

Further, it is possible to adjust increase/decrease of the lightquantity by a motion of the body of the operator detected by theacceleration sensor, the operator thereby does not need to operate theswitch with the operator's fingers, and the invention thus provides theoptimal light source device for use in medical practice.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a block diagram illustrating an electric circuit of a medicallight source device according to an Embodiment of the invention;

FIG. 2 is a flowchart illustrating one example of a processing procedurefor a control section to control lighting of an illumination sectionaccording to the Embodiment of the invention;

FIG. 3 is a block diagram illustrating an electric circuit of a medicallight source device according to another Embodiment of the invention;

FIG. 4 is a flowchart illustrating another example of a processingprocedure for a control section to control lighting of an illuminationsection according to another Embodiment of the invention;

FIG. 5 is a diagram illustrating a specific circuit configurationshowing an example of a current control circuit according to theEmbodiment of the invention;

FIG. 6 is a diagram illustrating a circuit configuration with a pulsedriving scheme adopted in the current control circuit according to theEmbodiment of the invention;

FIG. 7 is an explanatory view illustrating a state in which the medicallight source device is worn according to the Embodiment of theinvention;

FIG. 8 is an explanatory view of a battery holding belt of the medicallight source device according to the Embodiment of the invention;

FIG. 9 is an explanatory view in which a head band is a holder of themedical light source device according to the Embodiment of theinvention;

FIG. 10 is a schematic explanatory view showing a section along theapplication direction of light of a configuration for switching lightfrom a light source between diffusion and convergence;

FIG. 11 is a block diagram illustrating an electric circuit of a medicallight source device in the case of performing ON/OFF of an illuminationsection 1 and light quantity control using a voice recognitiontechnique;

FIG. 12 is a flowchart illustrating a processing procedure of aninterrupt by a timer interrupt of an MPU when an acceleration sensor isprovided;

FIG. 13 is an explanatory view illustrating a state in which an operatorchanges an application range corresponding to an object;

FIG. 14 is an explanatory view showing a side cross section of aconfiguration of an illumination section allowed to change theapplication direction and the application range;

FIG. 15 is a functional block diagram to explain control for changingthe application direction and the application range of the illuminationsection;

FIG. 16A is a flowchart illustrating a processing procedure for settingthe application direction; FIG. 16B is a flowchart illustrating aprocessing procedure for adjusting the application range; and

FIG. 17 is an explanatory view of a configuration in which theacceleration sensor is attached to a binocular loupe.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will be described below withreference to drawings.

Described first is an external configuration of a medical light sourcedevice according to an Embodiment of the invention. FIG. 7 shows a statein which an operator 40 wears the medical light source device. Anillumination section 1 is held with a binocular loupe worn by theoperator 40 and is worn on the head of the operator 40. Accordingly, inthis example, the binocular loupe is a holder 7. The holder 7 is notlimited to such a binocular loupe, and may be a cap or a head band. FIG.9 shows an example where a head band is the holder 7, and theillumination section 1 is attached to the head band. The head band ismade of a resin member, is held on the head of the operator by itselasticity and can thereby be fixed. The head band is not limited tosuch a configuration, and also as the material, there are various modessuch as cloth and rubber.

Referring again to FIG. 7, as part of the body of the operator 40, inthis example, a battery holding belt 8 is wound around the waist. To thebattery holding belt 8 are attached a battery power supply section 11(FIG. 1) provided with a plurality of mutually connected rechargeablebatteries 3 and a control unit 10 as shown in FIG. 8.

The batteries 3 of the battery power supply section 11 are connected tothe control unit 10, and the control unit 10 supplies a driving currentto the illumination section 1 through a code 42 to control illuminationoperation. The batteries 3 of the battery power supply section 11 arenot limited to a plurality of batteries, and there is a case that asingle large-sized battery 3 is allowed as long as the battery 3 iscapable of supplying stable power to the illumination section 1 over along time, but even such a heavy battery is capable of being worn onpart of the body by being attached to the battery holding belt 8.

Further, the control unit 10 performs charging control on the batteries3 when a charger 6 with a plug inserted therein is connected to anoutlet 41, and is capable of performing illumination operation by theillumination section 1 while charging the batteries 3.

Thus, the operator is capable of performing the medical treatment whileholding the batteries 3 with the battery holding belt 8 attached to partof the body, and the device is suitable as a medical light source devicerequired of long-duration medical treatment. Further, it is alsopossible to perform work while charging.

In the above-mentioned medical light source device, usually, theapplication direction of the illumination section 1 matches with thedirection in which the body (head, in this example) faces, and theinvention is to enable the application direction to be deflected in astate displaced from the direction in which the body faces by setting.

Referring to FIG. 13, the invention will be specifically described. Theillumination section 1 worn on the head 111 of the operator with theholder 7 applies light in the application range Sa shown by solid linesin accordance with the posture such that the operator stares at a targetportion A to perform the medical treatment. At this point, when theoperators needs to perform the treatment while checking a target portionB so as to perform the medical treatment on the target portion A, andwants to change the application range to a range Sb shown by dottedlines, the operator once moves the eye line from the target portion A tothe target portion B, sets the position of the eye line at the positionof the optical axis of the illumination section 1, and thereby holds astate in which the application direction of the illumination section 1is directed toward the target portion B even when the eye line isreturned to the target portion A.

At this point, an acceleration sensor detects the motion of the head 111that changes the eye line from the target portion A to the targetportion B, the optical axis is set with the position indicated byacceleration information being a center position of the applicationrange by the illumination section 1, and it is thereby possible todeflect in a state displaced from the direction in which the body faces.Then, by storing the detected acceleration information, the applicationdirection and the direction in which the body faces light always undergodeflection in a certain relationship.

As shown in FIG. 14, deflection of the application direction by theillumination section 1 is achieved by displacing the optical axis angleof a light source element 101 vertically, horizontally or circularly by360 degrees with a deflection member 105. By this means, to check thetarget portion B while treating the target portion A, the operator doesnot need to move the head 111 every time, is required only to change theeye line, and is capable of concentrating on the medical treatment.

Further, when the target portion A goes out of the application range Sbby changing the application range from Sa to Sb, the application angleis expanded so as to include the target portion A to widen theapplication range Sb. As shown in FIG. 14, it is possible to expand theapplication angle by increasing an aperture angle α of a reflector 102that is to apply light from the light source element 101 toward theobject. For example, as shown in FIG. 14, a cut is provided along theoptical axis direction in a part of a reflecting surface of thereflector 102 having the conical shape, the reflector 102 is tightenedand loosened in the center direction from the outside with a tighteningmember 104 to adjust the width of an overlapping portion 110 of oppositeend portions 103 a and 103 b of the reflector 102 with the cut made, andit is thereby possible to adjust the aperture angle α.

It is also possible to expand the application angle by adjusting aviewing angle of application light. An example of a configuration foradjusting a viewing angle of light will be schematically described withreference to FIG. 10. A diffusing member 91 provided with a plurality ofslits 92 that diffuses light from a light source 90 by reflectingincident light is disposed in front of the light source 90 on the lightoutput side. The diffusing member 91 is made movable between asolid-line position and a dotted-line position on the light outputsurface of the light source 90 by driving force of a driving section 93using a motor or solenoid, and by shifting the diffusing member 91 tothe position of solid line or dotted lines with the drive section 93, itis possible to widen or narrow the viewing angle of light of the lightsource 90.

Further, there is a configuration for switching between convergencelight and diffusion light with a liquid crystal shutter. In this case,response is high, and it is possible to switch instantaneously.

FIG. 15 is a functional block diagram to explain a change of theapplication range by the illumination section 1. An acceleration sensor106 is attached to the holder 7 together with the illumination section1, and is thereby capable of capturing a motion of the operator. FIG. 17shows an example in which the acceleration sensor 106 is attached to abinocular loupe 87.

As the acceleration sensor 106, it is possible to use various kindsincluding the mechanical type, optical type and semiconductor type, andas a medical light source device with a binocular loupe, cap, head bandor the like put on the head of the operator as the holder 7, thesemiconductor type is optimal in terms of making the size smaller.

Then, the acceleration sensor 106 is a two-axis sensor having mutuallyorthogonal X axis and Y axis, is attached to the holder 7 so that the Xaxis tracks the right-and-left axis of the operator and that the Y axistracks the back-and-forth axis of the operator, detects vibration by themotion of the head of the operator to transform into an electric signal,and outputs the signal with a signal cable 88.

At this point, when the acceleration sensor 106 is the two-axis sensor,in the case where the sensor section stands vertically, the sensor issometimes not able to detect a change of the motion by the operator. Asthe measures, in order for the acceleration sensor 106 to operate alsoin the case where the posture of the operator is upright, it ispreferable that the acceleration sensor 106 is attached to the holder 7at an angle in advance. By thus attaching, the two-axis sensor isadequate as the acceleration sensor 106, and to completely avoid theproblem, it is further preferable to perform acceleration detectionusing three-axis data and a gyro sensor.

Further, use of a three-axis sensor for the acceleration sensor 106enables the motion of the operator, particularly, an up-and-down motionto be detected in detail by the Y axis and Z axis, thereby improvesaccuracy of the application range to set, and is more effective.

An operation apparatus 107 is provided with an application rangeselection switch 107 a that the operator operates in changing theapplication range, a center setting switch 107 b that the operatoroperates in setting the center of the application range, and further, areset switch 107 c.

A position detecting section 108 detects up-and-down and right-and-leftpositions of the head 111 of the operator from values of acceleration ofX and Y output from the acceleration sensor 106. Then, when the centersetting switch 107 b of the operation apparatus 107 is operated, theposition detecting section 108 stores a position indicated byacceleration information at this point as the center position to outputto an optical axis adjusting section 109.

The optical axis adjusting section 109 drives a drive apparatus M₂ basedon the center position information to displace the deflection member105, and deflects the optical axis of the light emitting device 101 inaccordance with the center position. Thus, when the operator shifts theeye line from the target portion A to the target portion B and operatesthe center setting switch 107 b in FIG. 13, the target portion B is thecenter position of the application range. Then, even when the operatorreturns the eye line from the target portion B to the target portion A,the application range is held at Sb.

When the target portion A to actually perform the medical treatment isnot included in the application range Sb by deflecting the applicationrange, the operator operates the application range selection switch 107a of the operation apparatus 107 to enlarge the application range. Inresponse to the operation, an application control section 110 controls adrive apparatus M₁, adjusts tightening of the reflector 102 by thetightening member 104 in three stages, and thereby adjusts the apertureangle α. At this point, the application control section 110 controls thedrive apparatus M₁ corresponding to the number of times the applicationrange selection switch 107 a is operated, and changes the applicationrange.

Further, when the reset switch 107 c is operated, the operationapparatus 107 outputs a reset signal R to the position detecting section108 and application control section 110. The position detecting section108 clears the stored acceleration information by the reset signal R,the deflection state of the optical axis by the optical axis adjustingsection 109 is thereby canceled, and the application direction of theillumination section 1 is matched with the direction in which the headof the operator feces. Further, by the reset signal R being input, theapplication control section 110 adjusts the tightening member 104 so asto make the application range the narrowest range set as a default.

By using the acceleration sensor 106 that detects a motion of the head,it is possible to perform ON/OFF of the illumination section 1 and lightquantity control. In this case, when the application range selectionswitch 107 a and the center setting switch 107 b are pressed at the sametime, the position detecting section 108 outputs the accelerationinformation to an illumination control section 112.

By this means, the illumination control section 112 controls theillumination section 1 to increase a quantity of light by a rightwardshift of the operator, while controlling the illumination section 1 todecrease a quantity of light by a leftward shift of the operator.Further, the illumination control section 112 lights the illuminationsection 1 by an upward shift of the head, and extinguishes theillumination section 1 by a downward shift.

In this way, the acceleration sensor 106 detects the motion of the head,the operator performs switch operation of the operation apparatus 107 asappropriate, and it is thereby possible to set the application range ofthe illumination section 1 and perform ON/OFF of the section and lightquantity control.

In the above-mentioned description, the control configuration of themedical light source device according to the invention is described withthe functional blocks. FIG. 1 shows, in a block diagram, an electriccircuit of the medical light source device according to one Embodimentof the invention, and to a microprocessor unit (hereinafter, simplyreferred to as an MPU) are connected a current control circuit 2,illumination switch 5 that is operated in turning ON/OFF theillumination section 1, battery power supply section 11 comprised of aplurality of connected rechargeable batteries, AC adapter as a charger 6to charge the battery power supply section 11, acceleration sensor 106,drive apparatus M₁ of the tightening member 104, drive apparatus M₂ ofthe deflection member, and operation apparatus 107. As described above,the operation apparatus 107 includes the application range selectionswitch 107 a, center setting switch 107 b, and reset switch 107 c. Inaddition, the MPU, current control circuit 2, illumination switch 5 andoperation apparatus 107 are stored in the control unit 10 as describedpreviously, and held on the body of the operator with the batteryholding belt 8.

The illumination section 1 is connected to the current control circuit2, and corresponding to a control signal from the MPU, the currentcontrol circuit 2 adjusts a passing current from the battery powersupply section 11 to the illumination section 1, and thereby controlslighting and increase/decrease of the quantity of light. At this point,with the application range selection switch 107 a and center settingswitch 107 b pressed at the same time, based on the accelerationinformation output by the acceleration sensor 106 after detecting themotion of the head of the operator, the MPU outputs the control signalto the current control circuit 2.

In this Embodiment, when a control signal indicative of increasing thelight quantity is supplied from the MPU, the current control circuit 2changes the average current value fed to the illumination section 1 froma rated value so as to supply a current of an increase value higher thanthe rated value, and causes the section 1 to emit lighter. Accordingly,in order to protect the illumination section 1 from heat, it isnecessary to limit a period during which the section 1 emits with highoutput.

However, in the case of the light source device that the operator wearson the body, since the operator applies light by oneself, illuminancerequired for the operator is reserved. Further, in the case of medicaluse, a work time is limited which requires high precision needing toparticularly increase illuminance even in an operation continuing for along time, and therefore, even when limitations are imposed on theperiod to emit with high output, any practical problem does not occur.Conversely, such an device needs neither heat dissipation measuresagainst emission with high output for a long period nor a large-capacitybattery, is made compact, and is preferable as a light source deviceworn on the body.

The light source of the illumination section 1 is not limited to an LEDelement, and is only required to be a light source which does not becomedamaged immediately when the passing current exceeds a rated value andhas durability to some extent, and, for example, there are a halogenlamp and xenon lamp. However, a normal gas-filled incandescent lampcauses damage in the filament when the passing current exceeds a ratedvalue, and is not preferable. The halogen lamp has the tungsten filamentas the incandescent lamp, but tungsten recovers to the filament, evenwhen the lamp becomes a high temperature and tungsten sublimes, by thechemical reaction called the halogen cycle, and therefore, the halogenlamp has durability against heat. Further, the xenon lamp that does nothave the filament has higher durability.

Further, the MPU checks the power supply capacity of the battery powersupply section 11, and when the MPU detects a reduction in the voltage,lights an indicator 9 to warn. Then, when the charger 6 is connected tothe control section 4, the control section 4 controls the current supplyto charge the batteries in the battery power supply section 11 from thecharger 6 and charges.

Each functional block of the position detecting section 108, opticalaxis adjusting section 109 and application control section 110 describedin setting of the application range in FIG. 15 is programmed in aprocessing procedure for the MPU to set the application range. FIG. 16Ashows a flowchart of a processing procedure for setting the applicationdirection, and FIG. 16B shows a flowchart of a processing procedure foradjusting the application range.

In FIG. 16A, when the MPU detects that the center setting switch 107 bis operated, the MPU performs processing of step S101, and receivesacceleration data detected by the acceleration sensor 106. Then, inprocessing of step S102, the MPU drives the drive apparatus M₂ so that Xand Y positions of captured acceleration data become the center positionof the application range, adjusts the deflection member 105 to align theoptical axis of the illumination section 1, and deflects the applicationdirection to be a state displaced from the position of the head.

Next, in step S103, the MPU stores the acceleration information inmemory M, and holds the application direction of the illuminationsection 1 and the direction in which the body faces always in adeflection state with a certain relationship. When the reset switch 107c is operated, the MPU clears the memory M, drives the drive apparatusM₂ so that X and Y positions of the optical axis are respectively “0”,and cancels the deflection state.

In FIG. 16B, when the MPU detects that the application range selectionswitch 107 a is operated, the MPU counts the number of times the switch107 a is operated in step S201, drives the drive apparatus M₁corresponding to the number of times in step S202, and adjusts thetightening member 104 to enlarge the application range. When the resetswitch 107 c is operated, the MPU drives the drive apparatus M₁ so thatthe application range is the smallest application range.

Referring to a flowchart in FIG. 2, described is control for the MPU toadjust ON/OFF of the illumination section 1 and the light quantity by amotion of the head of the operator using the acceleration sensor 106. Inthis case, processing of a program by the MPU attains functions of amotion detecting section that detects a predetermined motion of the headby the operator based on the acceleration information from theacceleration sensor 106, and a light quantity control section thatcontrols the current control circuit 2 to adjust an amount of currentfed from the battery power supply section 11 to the illumination section1 when the predetermined motion is detected.

First, the MPU starts the processing procedure when the MPU detects anupward motion of the head of the operator using the acceleration sensor106 with the switches 107 a and 107 b of the operation apparatus 107pressed at the same time, and controls the current control circuit 2 soas to supply a rated value of current to the illumination section 1(step S1). The current control circuit 2 at this point is controlled bythe MPU so that an average current value fed from the battery powersupply section 11 to the illumination section 1 is the rated value. Inaddition, in this example, ON/OFF of the illumination section 1 is alsoperformed by operation of the illumination switch 5.

Then, the MPU checks whether the register R is set for a timer T2 flagF1 (step S2), and when the flag is not set, proceeds to step S4.Meanwhile, when the flag is set, the MPU adds a timer value to the timerT2 of the register R to perform timer timing (step S3). The processingof step S2 and step S3 will be clarified later. Herein, the timer flagT2 is not set, and the MPU performs processing of step S4.

In step S4, the MPU checks whether the operator moves the head downwardto give “instructions for the light to be extinguished” using theacceleration sensor 106 with the switches 107 a and 107 b pressed at thesame time. When the head does not move downward, in next step S5, theMPU checks whether the operator moves the head rightward to give“instructions for the light quantity to be increased” with theacceleration sensor 106. When the “instructions for the light quantityto be increased” are given, the MPU checks whether the timer T2 clockingin the register R finishes (step S6). In this case, since clockingoperation by the timer T2 is not performed, the MPU proceeds to nextstep S7, and sets the register R for an increase light quantity flag F0.

In this example, it is possible to adjust increases in the lightquantity in two stages. When the operator once shifts the head to theright and further shifts the head to the right with the switches 107 aand 107 b pressed at the same time, a higher increased current is fed tothe LED element of the illumination section 1 to cause the element toemit with the maximum light quantity. Accordingly, the MPU writes datafor distinguishing whether the light quantity increase is of the firststage or the second stage in the increase light quantity flag F0.

Then, the MPU outputs a control signal to the current control circuit 2so as to increase the light quantity from the illumination section 1 inresponse to the “instructions for the light quantity to be increased”(step S8). By this light quantity increasing control, the averagecurrent value fed to the illumination section 1 changes from the ratedvalue to an increase value higher than the rated value.

When a current of the increase value higher than the rated value is fedto the illumination section 1, the LED element generates heatcorresponding to a temperature increase characteristic thereof anddevelops a malfunction, and therefore, the time, during which the MPUfeeds the current of the increase value higher than the rated value tothe illumination section 1, is determined to be a predetermined periodbased on the temperature increase characteristic of the LED element.More specifically, the predetermined period is set so that thetemperature of the LED element within the predetermined period does notexceed a maximum allowable value based on the temperature increase timecharacteristic of the LED element.

Accordingly, after performing the light quantity increasing control, theMPU adds a timer value to the timer T1 of the register R to performtimer T1 timing (step S9). Then, as a result of addition, the MPUdetermines whether the value of the timer T1 reaches a predeterminedcriterion value, and thereby determines whether the timer time exceedsthe predetermined period (step S10). At this point, since increases ofthe light quantity are controlled in two stages, the predeterminedperiod is set to be shorter in the maximum light quantity, and the MPUis programmed to vary the criterion value of the value of the timer T1corresponding to the increase light quantity set on the increase lightquantity flag F0 in step S7.

For example, in the maximum light quantity, the light quantity isincreased by 40% as compared with the time of normal rated currentsupply, and the timer time of 20 minutes is set as the predeterminedperiod. In increasing the light quantity in the first stage, the timertime of 30 minutes is set as the predetermined period so as to increasethe light quantity by 30% as compared with the time of normal ratedcurrent supply.

In step S10, when the MPU determines that the value is within the timertime, the MPU checks whether the “instructions for the light to beextinguished” are given by a downward motion of the head (step S13), andwhen the “instructions for the light to be extinguished” are not given,performs the processing of from step S14. In this case, when theoperator shifts the head to the right to give “instructions for thelight quantity to be switched” from the light quantity increase of thefirst stage to the maximum light quantity or when the operator shiftsthe head to the left to give “instructions for the light quantity to beswitched” from the maximum light quantity to the light quantity increaseof the first stage, the MPU performs processing of step S15.Accordingly, the MPU rewrites the content of the increase light quantityflag F0 corresponding to the “instructions for the light quantity to beswitched”, while correcting a timer value of the timer T1 of theregister R, subsequently in step 16 switches to emission with the lightquantity indicated by the “instructions for the light quantity to beswitched”, and repeats the operation of from step S9. Accordingly, theincrease value of current is continuously fed to the illuminationsection 1, and the LED element emits lighter than usual.

In thus increasing the light quantity, when the “instructions for thelight to be extinguished” are given by a downward motion of the head(step S13), the MPU controls the current control circuit 2 to halt thesupply of current to the illumination section 1, and finishes lightingof the illumination section 1 (step S12). Concurrently, the controlsection 4 all clears the content of the register R to be the initialstate.

Meanwhile, when the MPU identifies an end of the timer time T1 in stepS10, the MPU sets the register R for a timer T2 flag E1, while clearingthe increase light quantity flag F0 (step S11), then shifts to theprocessing of step S1, switches the current supplied to the illuminationsection 1 to the rated value to switch emission of the LED element tothe normal state, and performs the operation of from step S2.

Thus, when the MPU performs the processing of step S2 after onceincreasing the light quantity of the illumination section 1, and feedingthe rated value of current again to return to the normal light quantity,since the MPU sets the register R for the timer 12 flag F1 in theprocessing of prior step S11, the MPU performs the processing of step S3subsequently, and adds a timer value to the timer T2 of the register Rto perform timer T2 timing. Then, the MPU checks the presence or absenceof the “instructions for the light to be extinguished” from the motionof the head (step S4). When the “instructions for the light to beextinguished” are not given, the MPU next checks the presence or absenceof the “light quantity increase” from the operator (step S5), and in theabsence, returns to step S2.

When the MPU is given the “instructions for the light quantity to beincreased” by the motion of the head of the operator in step S5, the MPUdetermines whether the value of the timer T2 reaches the predeterminedcriterion value in next step S6, and thereby determines whether thetimer T2 time exceeds the predetermined period. The predetermined periodat this point is the above-mentioned time required for the temperatureof the LED element to fall below the rated allowable value after theincrease value of current is fed to the illumination section 1.

When the timer T2 does not reach the predetermined period, the MPUperforms the processing of from step S2 from this state, keeps emissionof the LED element in the normal state, and performs timer T2 timing.Accordingly, within the period of the timer T2 after increasing thelight quantity of the illumination section 1, and feeding the ratedvalue of current again to return to the normal light quantity, the MPUdoes not feed an increase value of current even when the operator givesthe “instructions for the light quantity to be increased” by a rightwardshift of the head.

Then, when the timer T2 exceeds the predetermined period, the MPU clearsthe timer T2 flag F1 to proceed to step S7, sets the register R for theincrease light quantity flag F0, and controls the current controlcircuit 2 so as to feed the increase value of current to theillumination section 1.

The light quantity increasing control by the above-mentioned series ofcontrol is to feed the increase value of current exceeding the ratedcurrent within a range of the timer time that guarantees prevention ofdeterioration of the LED element due to heat in the illumination section1. In contrast thereto, it is also possible to prevent the LED elementfrom deteriorating, by detecting the increased temperature of theillumination section 1 with a temperature sensor in feeding the increasevalue of current exceeding the rated current.

FIG. 3 shows, in a block diagram, an electric circuit of a medical lightsource device provided with a temperature sensor, and components in thecircuit having the same functions as in FIG. 1 are assigned the samereference numerals to omit descriptions thereof. In this Embodiment, atemperature sensor 15 by a thermistor or the like is provided to measurethe temperature of the LED element of the illumination section 1.Referring to a flowchart in FIG. 4, described below is a processingprocedure for the MPU to control lighting of the illumination section 1in the electric circuit in FIG. 3.

The MPU starts the processing procedure when the MPU detects an upwardmotion of the head of the operator using the acceleration sensor 106with the switches 107 a and 107 b of the operation apparatus 107 pressedat the same time, or by operation of the switch 5, and controls thecurrent control circuit 2 so as to supply a rated value of current tothe illumination section 1 (step S21). The current control circuit 2 iscontrolled by the MPU so that an average current value fed from thebattery power supply section 11 to the illumination section 1 is therated value.

Then, the MPU checks whether the operator gives “instructions for thelight to be extinguished” by an upward shift of the head (step S22).When the “instructions for the light to be extinguished” are not given,the MPU next checks a rightward shift of the head by the operator, andthereby checks whether the operator gives “instructions for the lightquantity to be increased” (step S23). In the case where the“instructions for the light to be increased” are not given, the MPUrepeats the processing of from step S22. When the “instructions for thelight to be extinguished” are given in step S22, the MPU performsprocessing of step S33, controls the current control circuit 2 so as tohalt the supply of current to the illumination section 1 from thebattery power supply section 11, and halts emission operation.

Meanwhile, when the MPU detects that “instructions for the lightquantity to be increased” are given in step S23, the MPU captures anoutput from the temperature sensor 15 to detect the temperature, anddetermines whether the detected temperature is a predeterminedtemperature, for example, 80° C. in the case where the light source isan LSD element, or a lower temperature with a margin included (stepS24). When the detected temperature is less than the predeterminedtemperature, the MPU sets the register R for an increase light quantityflag F0 (step S25). The increase light quantity flag F0 is data toidentify a light quantity increase of the first stage or maximum lightquantity, by whether the operator moves the head rightward once ortwice.

Next, from the content of the increase light quantity flag F0, the MPUcontrols the current control circuit 2 so as to set the increased lightquantity of the first stage or the maximum light quantity indicated bythe motion of the head of the operator (step S26). By this lightquantity increasing control, the average current value fed to theillumination section 1 is changed from the rated value, and the currentof an increase value higher than the rated value is fed.

Then, in next step S27, the MPU checks whether the operator gives the“instructions for the light to be extinguished” by the motion of thehead, and when the instructions are not given, proceeds to processing ofstep S28 to check whether there are instructions for an increase lightquantity to be switched. In the state of performing light quantityincreasing control corresponding to alight quantity increase of thefirst stage, when the operator shifts the head rightward, the MPUrewrites the content of the increase light quantity flag F0 to data toidentify the maximum light quantity in step S29. Then, in next step S30,the MPU controls the current control circuit 2 so as to further increasethe light quantity from the illumination section 1, and performsprocessing of step S31. Meanwhile, in the state in which the operatorperforms control for the maximum light quantity, when the operatorshifts the head leftward, the MPU decreases the maximum light quantityto change to a light quantity increase state of the first stage.

Meanwhile, when the MPU identifies the absence of “instructions for thelight quantity to be switched” in step S28, since the MPU proceeds toprocessing of step S31, the increase light quantity is not changed, andthe emission state up to this point is maintained.

In step S31, the MPU captures an output from the temperature sensor 15to detect the temperature, and determines whether the detectedtemperature is a temperature less than the predetermined temperature.When the detected temperature is the predetermined temperature or more,the MPU repeats the operator of from step S27. Accordingly, the currentof the increase value of the operator flows into the illuminationsection 1 continuously, and the LED element emits lighter than usual ineither case.

Then, when the MPU identifies that the operator gives “instructions forthe light to be extinguished” by the motion of the head in step S27, theMPU performs the processing of step S33, controls the current controlcircuit 2 to halt the supply of the current to the illumination section1, and finishes lighting of the illumination section 1.

In the state in which the light quantity from the LED element of theillumination section 1 is increased, when the MPU detects that thedetected temperature by the temperature sensor 15 reaches thepredetermined temperature in step S31, the MPU resets the increase lightquantity flag F0 of the register R to perform the processing of S21,switches the supply current to the illumination section 1 to the ratedvalue to finish the light quantity increasing control, and performs theprocessing of from step S22.

Then, when the MPU identifies that the operator gives “instructions forthe light to be extinguished” by the motion of the head, the MPUcontrols the current control circuit 2 to halt the supply of the currentto the illumination section 1 (step S33). At the same time, the controlsection 4 resets the content of the register R to be the initial state.

When the operator does not give the “instructions for the light to beextinguished”, the MPU controls the current control circuit 2 to supplythe rated current to the illumination section 1, and the illuminationsection 1 emits with the normal light quantity. Then, the MPU identifiesthe absence of “instructions for the light to be extinguished” in stepS22, and when the MPU identifies instructions “for the light quantity tobe increased” in next step S23, performs the processing of step S24.Then, the MPU captures an output from the temperature sensor 15 todetect the temperature, determines whether the detected temperatureexceeds the predetermined temperature (step S24), and when thetemperature is less than the predetermined temperature, sets theregister R for the increase light quantity flag F0 corresponding toinstructions of the light quantity increase of the first stage or themaximum light quantity by the motion of the head of the operator (stepS25) to repeat the light quantity increasing control again. Accordingly,for a period during which the MPU confirms that the temperature of theLED element is less than the predetermined temperature in step S24, theMPU is capable of resuming the light quantity increase even afterfinishing the light quantity increase.

Control of the current supply to the illumination section 1 by the MPUin the control section 4 will be described, with specific circuitconfigurations of the current control circuit 2 shown. In addition, twoconfigurations of the current control circuit 2 are exemplified in FIGS.5 and 6, and the current control circuit 2 in either Embodiment of FIG.1 or FIG. 2 may also be used.

The current control circuit 2 as shown in FIG. 5 is constructed byconnecting a driving transistor Q1 connected on its collector side tothe LED element 29 that is a light source of the illumination section 1,and a resistance circuit 12 connected to the emitter side of thetransistor Q1 to power supply Vcc. Then, the MPU is connected at a porta to the base of the transistor Q1 through a resistance R11, andcontrols ON/OFF of the transistor.

The resistance circuit 12 is comprised of a resistance R1 connected atits one end to the emitter of the transistor Q1 with the other endgrounded, a series circuit of a transistor Q2 and resistance R2 parallelconnected to the resistance R1, and a series circuit of a transistor Q3and resistance R3 also parallel connected to the resistance R1. Then,the base of the transistor Q2 is connected to a port b of the controlsection 4 through a resistance R12, the base of the transistor Q3 isconnected to a port c of the control section 4 through a resistance R13,and the control section 4 controls ON/OFF of each transistor. Herein,the resistance R11, resistance R12 and resistance R13 are provided tolimit the base current to respective connected transistors.

A resistance value of the resistance circuit 12 is determined by acombined resistance value of the resistances R1, R2 and R3, and thecurrent limitation resistance value is R1 in the normal state in whichthe transistor Q2 and the transistor Q3 are off, is R1·R2/(R1+R2) whenthe transistor Q2 is on and the transistor Q3 is off, and isR1·R2·R3/(R1+R2+R3) when the transistor Q2 and the transistor Q3 areboth on.

At this point, the resistance values of the resistances R1, R2 and R3are set such that R1>R1·R2/(R1+R2)>R1·R2·R3/(R1+R2+R3), the supplycurrent to the LED element 29 is the rated value when the resistancevalue is R1, the supply current when the current limitation resistancevalue is R1·R2/(R1+R2) is an increase value, and the supply current whenthe current limitation resistance value is R1·R2·R3/(R1+R2+R3) isfurther increased. By this means, when the control section 4 switchesoff both the transistor Q2 and the transistor Q3, the rated value ofcurrent is supplied to the LED element 29 and the emission amount isnormal. When the transistor Q2 is switched on, an increase value ofcurrent is supplied and the emission amount is increased. When both thetransistor Q2 and the transistor Q3 are switched on, the supply currentis higher, and the emission amount increases.

Accordingly, when the MPU detects that the head of the operator shiftsupward by the acceleration sensor 106 with the switches 107 a, 107 bpressed at the same time, the MPU switches off the transistor Q2 and thetransistor Q3. Then, when the MPU detects that the head of the operatorshifts rightward once, the MPU switches on the transistor Q2, and whenthe MPU detects that the head of the operator shifts rightward twice,the MPU switches on both the transistor Q2 and the transistor Q3.

In the current control circuit 2 of such a configuration, when the MPUswitches on the transistor Q1 to supply power supply Vcc to the currentcontrol circuit 2, the current is fed to the LED element 29. At thispoint, since the control section 4 keeps the transistor Q2 and thetransistor Q3 off, the rated current is fed to the LED element 29, andnormal emission is performed. In addition, the MPU controls on/off ofthe transistor Q1 with a predetermined duty ratio to feed apredetermined current. Accordingly, the voltage applied to the LEDelement 29 is of a rectangular wave form, but is not limited to therectangular wave, and may be substantially a half wave form by makingthe rising edge and the falling edge the shape of steps. By this means,it is possible to resolve abrupt illuminance changes.

Then, when the MPU detects the motion of the head of the operator andswitches on the transistor Q2 or switches on both the transistor Q2 andthe transistor Q3, the current corresponding to the current limitationresistance value of the resistance circuit 12 is fed to the LED element29, and the LED element emits. Accordingly, when the MPU detects thatthe head of the operator shifts rightward once or twice during theillumination operation of the illumination section 1 with the ratedcurrent, the MPU controls the illumination section 1 so that an amountof current exceeding the rated current is fed to the LED element. Thus,the control section 4 controls the transistors Q1, Q2 and Q3 from theports a, b and c, and switches the emission amount of the LED element29.

Controlling the emission operation of the illumination section 1 is notlimited to the above-mentioned circuit configuration, and may be a pulsedriving scheme for controlling a duty ratio corresponding to designationof the illumination intensity with a switch device such as, for example,a transistor and MOSFET, on the circuit and thereby controlling acurrent fed to the illumination section 1.

FIG. 6 shows a configuration of the current control circuit 2 by thepulse driving scheme. In FIG. 6, for example, MOSFET is used as a switchdevice 31, and is connected so that a PWM (Pulse Width Modulation)signal from a pulse generator 32 is input to the gate side thereof. Whenthe PWM signal becomes a high level by a control signal from a port a′of the control section 4, the switch device 31 is turned on, the voltageof the battery power supply section 11 is applied, and the current flowsfrom the input side to the load side.

To the load side of the switch device 31 are connected an LED 34 of theillumination section 1 and a protective resistance R4 which is grounded.In the prior stage, a smoothing circuit comprised of a coil L and acapacitor C is provided, and it is configured that a pulse output byswitching operation is averaged and output. In the stage before the coilL, a diode 35 is provided to continue to supply a current to the coil Lwhen the switch device 31 is switched off. By this means, by controllingthe on time (off time) of the switch device 31, it is possible to adjustthe current fed to the illumination section 1. Accordingly, in thiscase, the control section 4 is capable of increasing the light quantityof the illumination section 1 by performing control for changing theduty ratio of the pulse generator 32. In addition, the voltage appliedto the LED element 29 is of a rectangular wave form, but is not limitedto the rectangular wave, and may be substantially a half wave form bymaking the rising edge and the falling edge the shape of steps.

When the MPU detects that the head of the operator shifts rightward onceor twice by the acceleration sensor 106 with the switches 107 a, 107 bpressed at the same time, the MPU performs the control for changing theduty ratio so that the average current value fed to the illuminationsection 1 is changed from the rated value and that an increase value ofcurrent higher than the rated value is fed. Then, when the operatorshifts the head rightward twice, the MPU makes the fed current higherthan in shifting once.

In the medical light source device according to the above-mentionedEmbodiment, by using the acceleration sensor 106 that detects a motionof the head, it is made possible to set the application range of theillumination section 1 and perform ON/OFF and light quantity control,and ON/OFF and light quantity control may be performed using a voicerecognition technique. In this case, by providing a switching switch forswitching between a voice mode and an acceleration mode, it is possibleto use both the acceleration sensor 106 and the voice recognitiontechnique.

FIG. 11 shows a configuration of a medical light source device in thecase of performing ON/OFF of the illumination section 1 and lightquantity control using the voice recognition technique, and componentsof the circuit having the same functions as in FIG. 1 are assigned thesame reference numerals to omit descriptions thereof.

In FIG. 11, a voice recognition section 5 is capable of recognizingabout several kinds of voices using the conventional publicly-knowngeneral voice recognition technique. For example, with the voicerecognition section 5 are registered voice patterns of several kinds ofwords required to indicate “light”, “extinguish”, “lighter”, “lightest”and the like, and the section 5 is configured to compare a signal ofvoice uttered by the operator collected in a microphone 5A to recognizethe content. When a command signal indicated by the voice is input fromthe voice recognition section 5, the MPU outputs a control signal to thecurrent control circuit 2 according to the command content.

In other words, when the voice recognition section 5 recognizes a voiceof “light”, the MPU outputs a control signal to supply a normal ratedcurrent from the battery power supply section 11 to the illuminationsection 1, and light the illumination section 1. Then, when the voicerecognition section 5 recognizes a voice of “lighter”, the MPU outputs acontrol signal to the current control circuit 2 so as to change theaverage current value fed to the illumination section 1 from the ratedvalue and supply the increase value higher than the rated value. Whenthe section 5 recognizes a voice of “lightest”, the MPU outputs acontrol signal to the current control circuit 2 so as to change theaverage current value fed to the illumination section 1 to a higherincrease value to supply.

The voice recognition section 5 and microphone 5A are integrated into asingle unit, and are stored in the control unit 10 together with the MPUand current control circuit 2, and it may also be configured that themicrophone 5A is separated from the voice recognition section 5, isplaced near the mouth or the chest of the operator, and is connected tothe voice recognition section 5 by wireless or cable. For example, inthe head band that is the holder 7 of the illumination section 1 asshown in FIG. 9, the microphone 5A is attached together with theillumination section so as to position near the mouth of the operator.

Further, the medical light source device as shown in FIG. 11 controls anemission amount of the illumination section 1 from a motion of theoperator using the acceleration sensor. In this case, it is preferableto provide a second acceleration sensor to control an emission amountindependently of the acceleration sensor 106. A second accelerationsensor 80 is attached to the holder worn on the body of the operator asin the acceleration sensor 106, but may be a uniaxial sensor only todetect a motion of the operator.

In medical operations, it is assumed that the time with the need forapplying a higher quantity of light to a part in the medical treatmentsuch as, for example, cutting and suture of a blood vessel or minuteportion and the like is almost 20% of the whole, and by controlling todim the illumination section 1 during a period except the time of almost20%, it is possible to suppress consumption of the power supply.Accordingly, when the time is judged as being not during the medicaloperation from the motion of the operator detected by the accelerationsensor, the supply current to the illumination section 1 is switched tothe rated value. By this means, in a state in which the average currentvalue fed to the illumination section 1 is set to be changed from therated value so as to feed the current of the increase value higher thanthe rated value, the current value is switched to the rated value, andit is thereby possible to suppress consumption of the power supply.

In the medical treatment such as cutting and suture of a blood vessel orminute portion in an operation, the operator fixes the illuminationsection 1 to concentrate light on the treatment target portion, andtherefore, does not make a large motion. Accordingly, the acceleration,which is detected by the acceleration sensor 80 held by the holdertogether with the illumination section 1, is small, and the MPU causesthe section 1 to emit with the intensity required by the operator.

Meanwhile, even in the operation, during the time the operator does notperform the medical treatment directly, since the operator makes a largemotion such that the operator shifts the entire body by preparationworking and the like, the acceleration detected by the accelerationsensor 80 is large. Then, when the acceleration is a predetermined valueor more, the MPU controls the current control circuit 2 to reduceilluminance of the illumination section 1, and effective use of thebattery power supply section 11 is thereby made. At this point, when theacceleration detected by the acceleration sensor 80 is the predeterminedvalue or more, illumination of the illumination section 1 may be halted.

Described is operation of the MPU in the case of controlling theemission amount with the acceleration sensor 80. The MPU during theexecution of the processing procedure by the flowchart in FIG. 2 or 3periodically monitors an acceleration detection signal from theacceleration sensor 80 by timer interrupt. FIG. 12 is a flowchartillustrating the operation in interrupt processing of the MPU at thetimer interrupt. The MPU checks whether the increase light quantity flagF0 (FIG. 1, FIG. 2) is set in step S31, and when the flag is not set,returns to the processing prior to the timer interrupt.

Meanwhile, when the increase light quantity flag F0 is set, in thiscase, the MPU is controlling the current control circuit 2 so as to feedthe current of the increase value exceeding the rated current to the LEDelement, and performs the processing of step S32. Then, the MPU capturesa detection signal from the acceleration sensor 80 to determine whetherthe signal value from the acceleration sensor 80 is a predeterminedvalue or more (step S33). At this point, when the operator makes a largemotion and performs work except the medical treatment, the signal valueis the predetermined value or more, and the MPG controls the currentcontrol circuit 2 so as to drop the average current value fed to theillumination section 1 to the rated value to decrease illuminance of theillumination section 1 (step S34), and returns to the processing priorto the timer interrupt.

Meanwhile, when the signal value from the acceleration sensor 80 is lessthan the predetermined value, the MPG recognizes that the operator doesnot make a large motion and is during the operation, and that there isno need for decreasing illuminance of the illumination section 1, andreturns to the processing prior to the timer interrupt.

By adding such interrupt processing by the timer interrupt, in feedingthe current exceeding the rating of the illumination section 1 toincrease the light quantity, when the operator does actually not performthe medical treatment such as concentrating light on the treatmenttarget portion, the MPU is capable of returning to normal emissioncontrol, being effective at preventing consumption of power of thebattery power supply section 11 and protecting the illumination section1.

INDUSTRIAL APPLICABILITY

The present invention relates to the medical light source device whichis attached to the body of the operator, and which enables the directionin which the body faces and the application direction of light to be setin a displaced state when necessary where the direction in which thebody faces and the application direction are usually matched, and hasindustrial applicability.

DESCRIPTION OF SYMBOLS

-   1 Illumination section-   2 Current control circuit-   5 Voice recognition section-   5A Microphone-   7 Holder-   11 Battery power supply section-   80 Acceleration sensor-   106 Acceleration sensor-   107 Operation apparatus-   107 c Reset switch (reset means)-   108 Position detecting section-   109 Optical axis adjusting section-   110 Application control section

The invention claimed is:
 1. A medical light source device that is wornon the body of an operator to apply light to a target portion of themedical treatment, comprising: a holder to put an illumination sectionon the body of the operator; an acceleration sensor attached to theholder; a position detecting section that detects a center position tohold based on acceleration information detected by the accelerationsensor in setting the center position of an application range; and anoptical axis adjusting section that sets an optical axis of theillumination section at the detected center position.
 2. The medicallight source device according to claim 1, further comprising: anapplication control section capable of adjusting an application angle ofapplication light from the illumination section in a plurality ofstages.
 3. The medical light source device according to claim 1, whereinthe holder is to put the illumination section and the accelerationsensor on the head of the operator.
 4. The medial light source deviceaccording to claim 1, wherein the acceleration sensor has an X axis anda Y axis that are mutually orthogonal, and is attached to the holder sothat the X axis tracks a right-and-left axis of the operator and thatthe Y axis tracks a back-and-forth axis of the operator.
 5. The medicallight source device according to claim 4, wherein the accelerationsensor is attached to the holder while being beforehand provided with apredetermine angle with respect to a vertical direction.
 6. The mediallight source device according to claim 4, wherein the accelerationsensor is a three-axis sensor further including a Z axis.
 7. The medicallight source device according to claim 1, further comprising: resetmeans for clearing the center position held in the position detectingsensor to cancel setting of the optical axis.
 8. A medical light sourcedevice that is worn on the body of an operator to apply light to atarget portion of the medical treatment, comprising: a holder to put anillumination section on the body of the operator; a battery power supplysection that supplies power to the illumination section; an accelerationsensor attached to the holder; a motion detecting section that detects apredetermined motion by the operator based on acceleration information;and a light quantity control section that controls an amount of currentfed from the battery power supply section to the illumination sectionwhen the predetermined motion is detected.
 9. The medical light sourcedevice according to claim 8, wherein the illumination section isprovided with a light source having durability even when a passingcurrent exceeds a rated value, and the light quantity control sectionchanges an average current value fed from the battery power supplysection to the illumination section from a rated value to an increasevalue higher than the rated value only for a predetermined period inincreasing the amount of current.
 10. The medical light source deviceaccording to claim 9, wherein the predetermined period is set based on atemperature increase time characteristic of the light source due topassage of the increase value of current.
 11. The medical light sourcedevice according to claim 9, wherein the predetermined period is set ata period during which a temperature of the light source does not exceeda maximum allowable value, based on the temperature increase timecharacteristic of the light source.
 12. The medical light source deviceaccording to claim 9, wherein a second acceleration sensor is attachedto the holder, and the light quantity control section switches a valueof current fed to the illumination section to the rated value of currentwhen the acceleration sensor detects acceleration of a predeterminedvalue or more, in performing control for feeding the increase value ofcurrent as the average current value fed to the illumination section.13. The medical light source device according to claim 8, furthercomprising: a voice recognition section that recognizes a voice utteredby the operator, wherein the light quantity control section controls theamount of current fed to the illumination section based on either therecognized voice in the voice recognition section or the accelerationinformation.